Support Ambari 2.0.0

[Joseph-R]

Ran into an issue today, using this cookbook to expand an old cluster that was provisioned with Ambari 2.0.0.

The repos under the case switch https://github.com/jp/ambari/blob/master/attributes/default.rb#L17 for Ambari 2.0.0 had been switched to the repos for 2.0.1 in #4ed33fb.

This meant any node provisioned with that code and added to an existing cluster would have an inconsistent version on the Ambari Server (2.0.0) and the newly-provisioned Ambari Agent (2.0.1) and fail to register.

INFO 2015-10-29 18:56:40,612 NetUtil.py:60 - Connecting to https://ip-10-0-1-168.ec2.internal:8440/connection_info
INFO 2015-10-29 18:56:40,724 security.py:93 - SSL Connect being called.. connecting to the server
INFO 2015-10-29 18:56:40,816 security.py:55 - SSL connection established. Two-way SSL authentication is turned off on the server.
ERROR 2015-10-29 18:56:40,860 Controller.py:143 - Cannot register host with non compatible agent version, hostname=ip-10-0-1-161.ec2.internal, agentVersion=2.0.1, serverVersion=2.0.0
INFO 2015-10-29 18:56:40,860 Controller.py:350 - Registration response from ip-10-0-1-168.ec2.internal was FAILED

Anyways, I ran into this today, saw the bug, and fixed it in 9876342.